Weight Trend Calculator

Daily weight fluctuates by 2-5 pounds due to water retention, food volume, hormones, and hydration — not fat changes. A 7-day moving average smooths out this noise to reveal your true fat-loss or gain trend. Many coaches recommend using the trend line rather than daily scale readings to avoid discouragement from normal fluctuations.

Safe, sustainable fat loss is typically 0.5-2 lbs per week (0.25-1 kg), achieved through a 250-1000 calorie daily deficit. Faster rates increase muscle loss risk and are harder to sustain. The 7-day trend smooths enough data to give a reliable weekly rate estimate after 2-3 weeks of consistent logging.

The 7-day moving average takes the average of the last 7 daily weigh-ins. Each day, the oldest reading drops off and the newest adds on. This creates a smoothed line that represents your true trend without day-to-day noise. It requires at least 7 data points to compute.

Weigh yourself at the same time each day under the same conditions — ideally first thing in the morning, after using the bathroom, before eating or drinking. This maximizes consistency. Consecutive daily readings are best for trend analysis, but even 4-5 readings per week provide useful data.

The projection assumes your current trend rate continues unchanged. As you approach your goal weight, your deficit may naturally decrease (lighter body burns fewer calories), slowing the rate. Treat the projection as a rough planning guide, not a precise deadline.